early 14c., from Old French abonder "to abound, be abundant, come together in great numbers" (12c.),
from Latin abundare "overflow, run over,"
from Latin ab- "off" (see ab-) + undare "rise in a wave," from unda "water, wave" (see water (n.1)).
What is the meaning of "off", while during a "rise in a wave"? Is there some hypotaxis?
I don't understand Prof. John Lawler's example with coffee sloshing in a cup held by walkers:
Ever tried to walk fast carrying a full cup of coffee? The coffee rises in waves set off by the motion and sloshes over from the top of the cup, if you're not careful. BTW, hypotaxis is a literary term, not a linguistic one. You've got to stop trying to learn grammar from a dictionary. Greek terms were coined for Greek by ancient Greek grammarians, who had extremely odd notions about language (where 'language' = 'Homeric Greek'; other people spoke barbaric languages, not real ones), and are rarely useful. But they do impress people, for sure.